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The Intestines

The Intestines. p. 461-467, 474-478. Small Intestine Anatomy. Pyloric sphincter Duodenum Jejunum Ileum Ileocecal valve Coils attached to mesentery. Small Intestine Functions. Completes chemical digestion Absorbs nutrients & H 2 O

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The Intestines

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  1. The Intestines p. 461-467, 474-478

  2. Small Intestine Anatomy • Pyloric sphincter • Duodenum • Jejunum • Ileum • Ileocecal valve • Coils attached to mesentery

  3. Small Intestine Functions • Completes chemical digestion • Absorbs nutrients & H2O • Huge surface area (villi & microvilli in jejunum & ileum)

  4. Sm. Intestinal Secretions • Goblet cells– mucus • Intestinal glands – secrete “brush border enzymes” to digest: • Carbs  monosacch. • Proteins  AA’s • Duodenum also receives secretions of liver (via bile duct) & pancreas (via pancreatic ducts)

  5. Nutrient Absorption • Huge surface area • Circular folds, villi, microvilli • Absorption  capillary beds, lacteals • Peyer’s patches – keep bacteria out of bloodstream

  6. Large Intestine Anatomy • Haustra • Ileocecal valve • Cecum • Appendix • Colon • Ascending • Transverse • Descending • Sigmoid • Rectum • Anal canal

  7. Large Intestine Functions • No digestive function • Goblet cells – mucus • Beneficial bacteria – make vitamins we can use (K, some B) and gas • Absorbs water, some vitamins, & electrolytes – but no villi • Elimination of feces

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